128-21-2 3B-HYDROXY-5B-PREGNAN-20-ONE 3beta-Hydroxy-5beta-tetrahydroprogesterone 5beta-Pregnan-20-one, 3beta-hydroxy- (8CI) 5beta-Pregnanolone Epipregnanolone NSC 21450 Pregnan-20-one, 3-hydroxy-, (3beta,5beta)- (9CI) Pregnan-3beta-ol-20-one (VAN) Pregnanolone I